Ronald R Robb

US Patent:

54981328, Mar 12, 1996

Filed:

Oct 31, 1994

Appl. No.:

8/331747

Inventors:

Eugene J. Carozza - Wilton CT
Gregory R. Frank - Muskegon MI
Charles F. Caccavale - Wharton NJ
Ronald R. Robb - Randolph NJ

Assignee:

Howmet Corporation - Greenwich CT

International Classification:

F01D 518

US Classification:

416 97R

Abstract:

A hollow cast product such as a gas-cooled gas turbine engine blade is formed using a composite core constructed by forming a first core part determinative of the cavity size of the trailing edge blade portion from a first ceramic material and joined to a second core part determinative of the blade cavity for the blade body portion which is formed from a second ceramic material. The first and second ceramic materials can be chosen to have appropriate characteristics grain sizes, flowability, leachability, and/or reactivity characteristics taking into consideration the different dimensional restrictions imposed by the desired blade product. A tongue is formed on the adjoining edge surface of the trailing edge core part, and the trailing edge core part is then inserted into a second die and the body core part is formed, including a complementary groove member which is formed around the tongue member on the trailing edge core part. The joined trailing edge and body core parts can then be sintered to form a composite casting core. Blade trailing edge slot thicknesses of about 0.

US Patent:

53949323, Mar 7, 1995

Filed:

Feb 5, 1992

Appl. No.:

7/831528

Inventors:

Eugene J. Carozza - Wilton CT
Gregory R. Frank - Muskegon MI
Charles F. Caccavale - Wharton NJ
Ronald R. Robb - Randolph NJ

Assignee:

Howmet Corporation - Greenwich CT

International Classification:

B22C 910

US Classification:

164137

Abstract:

A composite core for a hollow gas turbine engine blade is constructed by forming a first core part determinative of the cavity size of the trailing edge blade portion from a first ceramic material and joined to a second core part determinative of the blade cavity for the blade body portion which is formed from a second ceramic material. The first and second ceramic materials can be chosen to have appropriate characteristics grain sizes, flowability, leachability, and/or reactivity characteristics taking into consideration the different dimensional restrictions imposed by the desired blade product. A tongue is formed on the adjoining edge surface of the trailing edge core part, and the trailing edge core part is then inserted into a second die and the body core part is formed, including a complementary groove member which is formed around the tongue member on the trailing edge core part. The joined trailing edge and body core parts can then be sintered to form a composite casting core.

US Patent:

41904508, Feb 26, 1980

Filed:

Nov 17, 1976

Appl. No.:

5/742593

Inventors:

Ronald R. Robb - Dover NJ
Charles Yaker - Summit NJ
Lamar Burd - Andover NJ

Assignee:

Howmet Turbine Components Corporation - Muskegon MI

International Classification:

B28B 734

US Classification:

106 389

Abstract:

Cores for use in the casting of hollow metal parts by directional solidification from temperatures which may exceed 2700. degree. F. , in which the strength, dimensional stability and shape of the core is maintained at such high temperatures by formulating the core to contain Cristobalite in an amount of at least 2. 5% by weight.